[Feature Request] Webpage-like Scrolling with Keyboard in Long Strip/Vertical Reading Mode

[P0bo]

Description

Current Behavior:
In the app's long strip or vertical reading mode, the arrow keys currently allow for stepped scrolling up and down. However, this scrolling behavior often causes the screen to land awkwardly between panels, which interrupts the reading flow. As a result, we have to adjust the position using the mouse to align the panels correctly, which is inconvenient.

Feature Suggestion:
I would like to suggest implementing webpage-like navigation when reading in long strip or vertical mode using the keyboard. Specifically:

• Stepped scrolling using the space bar: This would allow users to scroll the page one panel or screen at a time, making it easier to navigate without interrupting the reading experience.
• Smooth scrolling using the up/down arrow keys: Instead of stepped scrolling, the arrow keys could be used for smooth scrolling. Holding down the arrow keys should allow for continuous scrolling, giving users better control over where to stop without overshooting panels.

Benefits:

• Enhanced navigation experience when reading in long strip/vertical modes.
• Reduced need for constant mouse adjustments.
• Smoother, more intuitive control when navigating with the keyboard, allowing readers to maintain a seamless flow between panels.

By adding these features, it would improve the overall reading experience, particularly for users who use keyboard navigation.

I acknowledge that:

• I have updated to the latest version of the app (stable is v8.7.0)
• I have updated all extensions
• If this is an issue with an extension, that I should be opening an issue in https://github.com/inorichi/tachiyomi-extensions